In addition to adding some nice speed and interface enhancements (like swiping up to check for…
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By using Dropbox to attach links to files in Sparrow, you don't have to worry about file attachment sizes any more. Drag the files you want to attach and they're uploaded and synced to Dropbox; the recipient gets a link to the file for downloading.

Sparrow 1.5 also brings speedier search to your inbox and the ability to block images to help control spam.